Difference between revisions of "Eragrostis minor"

Revision as of 21:29, 16 December 2019

Illustrator: Cindy Roché, Linda A. Vorobik

Plants annual; tufted, without innovations. Culms 10-45 cm, erect to decumbent, sometimes with a ring of glandular tissue below the nodes. Sheaths sometimes glandular on the midveins, hairy at the apices, hairs to 4 mm; ligules 0.2-0.5 mm, ciliate; blades 1.5-10 cm long, 1-3(4) mm wide, flat, glabrous or sparsely white-hairy, margins sometimes with crateriform glands. Panicles 4-20 cm long, 2.2-8(10) cm wide, ovate, open to contracted, rachises sometimes with glandular spots or pits below the nodes, rarely with a glandular ring, glands usually dull, greenish-gray to stramineous; primary branches 0.5-6 cm, diverging 20-100° from the rachises; pulvini glabrous or hairy; pedicels 1-4 mm, stiff, straight, divergent, usually with a distal ring of crateriform glands. Spikelets 4-7(11) mm long, 1.1-2.2 mm wide, narrowly ovate, mostly reddish-purple to greenish, occasionally grayish, with 7-12(20) florets; disarticulation acropetal, paleas persistent. Glumes broadly ovate, membranous; lower glumes 0.9-1.4 mm; upper glumes 1.2-1.6 mm; lemmas 1.4-1.8 mm, broadly ovate, membranous, keels occasionally with 1-2 crateriform glands, apices acute to obtuse; paleas 1.3-1.7 mm, hyaline, keels smooth or scabridulous, scabridities to 0.1 mm, apices obtuse to acute; anthers 2, 0.2-0.3 mm, reddish-brown. Caryopses 0.4-0.7 mm, ellipsoid, not grooved, striate, light brown. 2n = 40.

Wash., Del., D.C, Wis., W.Va., Conn., Mass., Maine, N.H., R.I., Vt., Fla., Wyo., N.J., Tex., La., Nebr., Tenn., N.C., S.C., Pa., N.Y., Nev., Va., Colo., Md., Calif., Ala., Ark., Ill., Ga., Ind., Iowa, B.C., N.B., N.S., Ont., P.E.I., Que., Sask., Idaho, Mont., Oreg., Kans., Okla., Ohio, Utah, Mo., Minn., Mich., Miss., Ky., S.Dak.

Discussion

Eragrostis minor is a European species that now grows in gravelly roadsides and disturbed sites, especially near railroad yards, at 20-1600 m in southern Canada and the contiguous United States.

Selected References

None.

Lower Taxa